DoH
DoH is a newer DNS protocol; as the name implies, it is carried over HTTPS, and in fact, the DNS queries and responses are similar in form to an application programming interface (API). This new protocol was supported first in many browsers rather than natively in mainstream operating systems. It is, however, now available on most mainstream operating systems, just not enabled by default.
In order to verify a DoH server remotely, the curl (a pun on "see url") tool can do the job nicely. In the following example, we're querying against Cloudflare's name server:
$ curl -s -H 'accept: application/dns-json' 'https://1.1.1.1/dns-query?name=www.coherentsecurity.com&type=A'
{"Status":0,"TC":false,"RD":true,"RA":true,"AD":false,"CD":false,"Question":[{"name":"www.coherentsecurity.com","type":1}],"Answer":[{"name":"...
